Abstract

A model of the ∼2μm amplified spontaneous emission (ASE) generation
in the thulium-doped silica fibers pumped at 1575 nm is presented. Both
Al-codoped and Al/Ge-codoped fiber core compositions are studied. The results
show that the composition affects the relative slope efficiency of 10% and the
bandwidth of 19% of the output ASE. Our results predict that the backward ASE is
more powerful and spectrally broader compared to the forward ASE, which is in
agreement with previous experiments. Using an asymmetric cavity feedback, 98% of
the total output power can be directed in the backward ASE, but with the
consequence of losing ∼50% of the bandwidth. Such sources are expected to
deliver single-mode output with more than 70% slope and 39% power conversion
efficiency.

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